Henry c



(No Model.) H. C. THOMSON.

ELECTRIC BATTERY.

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UNITED 'STATES PATENT OFFICE.

HENRY C. THOMSON, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE ELECTRIC GAS LIGHTING COMPANY, OF SAME PLACE.

E LEC'TRIC BATTERY.

SPECIFICATION forming part of Letters Patent No. 568,007', dated September 22, 1896. Application iiled June 25, 1896. Serial No. 596,827. (No model.)

.zinc element which it is desired to hold separated from each other, and both of which are placed in a containing-jar.

The purpose of my invention is to hold the two elements constantly and always separated from each other without the use of plugs or rubber rings, as has heretofore been usual,

and also at the same time to secure such assembling of the zinc, the carbon, and the cover for the containing-jar as will facilitate the handling, transportation, and use of the battery.

Referring to Letters Patent to W. WV. Burnham, No. 520,033, it will be seen that a method of obtaining some of the above-mentioned results was thereby obtained; but that patent necessitated the use of the rubber ring therein described, as well as the peculiar formation of the head of the carbon element.

I accomplish the objects above mentioned and effect my improvement by changes in the construction, form, and methods of connecting the several parts of the battery.

My invention will be more fully understood by reference to the drawings, in whichu Figure lis a sectional elevation of the jar cover, carbon, and zinc. Fig. 2 is a perspective view of the cylindrical zinc element. Fig. 3 is an inverted plan of the cover, showing the way in which the same is grooved. Fig. i is a sectional view through the cover, the carbon, the cylindrical zinc, and the sup portingscrew therefor.

I will now more particularly describe my im provement. The top of the carbon element A (shown in Fig 4) will be seen to be constructed with a screw-thread a immediately below the top d of the carbon. The cover C will be seen to have a corresponding thread c, which,

semble these elements, the cover C is placed over the top of the carbon A, resting upon the shoulder a2, while the screw-rod b2 of the cylindrical zinc B fits into the slot c', and the projections b b b will pass up into the annular groove c2 of the cover, still leaving the space b5 between the rest of the top of the cylindrical zinc and the cover. Upon turning the screw-nut b3 these parts, namely, the carbon, the zinc, and thecover, will be assembled and appear as in Figs. l and 4, and, owing to the firmness with which they are thus held together, will be in a condition tobe handled as a unit without affecting the relative position of any of these parts. Thus assembled they may be placed in the outer jar X, upon the top of which will rest the seat c3 of the cover C. Afterbeing thus placed they will also remain in' a irm fixed position.

Having described my invention, what I claim is- In an electric open-circuit battery, the coinbination of a carbon element A, having the neck a screw-threaded, the cylindrical zinc B, having the projections b b, b', screw-rod b2, and nut b3, the perforated cover C, having the thread c, slotc, groove c2, and seat c3; .all substantially as and for the purposes described. f

In witness whereof I have hereunto subscribed my name this 24th day of June, 1896.

HENRY C. THOMSON.. In presence of-' FEED C. CHAMBERLIN, W. H. LEONARD. 

